I am having this same trouble with ALL of my clients.  Some are using their phone number still, so I have to wait for them to respond to me, often times it's too late and I have to resend a code.  I think this is a push for quickbooks accountant, but I can not be sure.  I hope that this is soon over... because I used to not have to text a code each time.  This will soon get annoying especially for my clients who will need to text MY phone number for THEIR accounts. Quickbooks!!! HELP!!!!